Humyo, is in my opinion the best onine storage site out there. While they use to give 30GB free space to new users, now its (still more than most others) 10GB free space.
For the Home users, the monthly subcription amounts to £4.59, annual is £45.99. Now they are offering the annual subs for £22.99. A brilliant deal for 100GB and lots of other benefits.
Voucher code to use at checkout: 50FFG1209
Edit: Apologies, I forgot to add the voucher code and have amended the text.